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London 1997 and the Doctor expects to arrive in spring — but it's snowing hard and everything is covered in snow and ice. Exploring, they encounter giant green Abominable aliens carrying people off. The Eleventh Doctor and Clara Oswald escape the aliens by sledging towards the frozen Thames on a wheelie bin, where they find in the ice a spacecraft. Inside is like a freezer with its own icy larder full of human bodies. The machine has frozen London instantly and the Doctor needs to reverse its polar polarity. It is Clara who suggests plugging it in to the TARDIS and very soon the freeze is undone with the snow actually falling upwards. As spring arrives suddenly in London the alien invaders are thwarted by the heat having thrived in the early freezing conditions.